How to Clear EEC 61 Code on Freightliner Trucks? Expert Tips | Vehicle Fixing (2024)

Freightliner trucks, renowned for their performance and durability, sometimes display the EEC 61 code, which can be concerning for operators. This is a general code related to the Aftertreatment System, which is vital for the truck’s emissions control. Clearing this code requires understanding its origins and addressing the root issue. This guide outlines the steps to identify, address, and how to clear EEC 61 code, ensuring your vehicle operates efficiently and compliantly.

How to Clear EEC 61 Code on Freightliner Trucks? Expert Tips | Vehicle Fixing (1)

What does Code EEC 61 on a Freightliner Mean?

On a Freightliner truck, an EEC 61 fault code typically relates to the Aftertreatment System, which is associated with the emissions and exhaust filtering. The code itself is a common code indicating a fault, but it doesn’t specify the exact nature of the problem.

When you see “EEC 61 code Freightliner,” it’s a broad category that essentially means an issue has been detected in the after-treatment system. This system includes components like the Diesel Particulate Filter (DPF), Diesel Exhaust Fluid (DEF) system, Selective Catalytic Converter Reduction (SCR) system, and other emissions-related components.

How to Clear EEC 61 Code?

Clearing an EEC 61 Freightliner code (or any other fault code, for that matter) requires a combination of addressing the underlying issue that caused the code and then using a diagnostic tool to reset or clear the code. Here are the general steps to clear the code:

1. Diagnosis

Before clearing any codes, it’s essential to diagnose the problem causing the code to ensure it doesn’t return:

  • Use a Diagnostic Tool: Connect a diagnostic scan tool or code reader to your vehicle’s OBD-II port or the appropriate diagnostic connector. This will allow you to read more detailed information regarding the fault, often displayed as SPN and FMI numbers.
  • Interpret the Results: Analyze the specific fault information to determine the root cause. For instance, if it’s related to the DEF system, it might be due to DEF quality, a faulty DEF pump, or blocked dosing lines.

2. Address the Underlying Issue

You’ll need to address the actual problem causing the fault code:

  • DEF System Issues: If related to the DEF system, you might need to:
    • Check and, if necessary, replace the DEF fluid.
    • Inspect the dosing unit and lines for blockages or malfunctions.
    • Ensure the DEF pump is functioning correctly.
  • DPF Regeneration: If the issue is with the DPF, you might need to perform a forced regeneration using the diagnostic tool, or in some cases, manually clean or replace the DPF.
  • Sensor and Component Issues: Replace any faulty sensors or components identified during the diagnostic phase.

3. Clear the Code

  • Use the Diagnostic Tool: Once you’ve addressed the underlying issue, return to your diagnostic tool.
  • Navigate to the “Clear Codes” Option: Most diagnostic tools have a menu-driven interface. Navigate through the menus to find the option to “Clear Fault Codes” or a similarly-worded command.
  • Clear Code: Follow the prompts on the tool to clear the EEC 61 code.
  • Recheck: After clearing the DTC code, it’s wise to recheck to ensure no faults remain. This ensures that the issue was adequately addressed.

4. Monitor the Vehicle

After you’ve cleared the code, it’s essential to monitor the vehicle to ensure the problem doesn’t reoccur. If the code returns, further diagnostics and repairs may be necessary.

Important Note:

It’s vital to address the root cause of the fault code rather than just erasing it. Simply clearing the code without fixing the underlying problem will likely result in the code returning shortly after. If you’re uncertain about any part of the process, it’s advisable to consult with a professional technician or refer to the vehicle’s service manual.

Prevention Tips:

You can follow the below suggestions to prevent the issue:

  1. Regular Maintenance: Follow the manufacturer’s guidelines for scheduled maintenance, including DPF regens and DEF system checks.
  2. High-Quality DEF: Always use DEF that meets the required standards to avoid contamination or DEF quality issues.
  3. Drive Properly: Believe it or not, your driving style can impact the aftertreatment system. Try to avoid excessive idling, and when possible, ensure your trips are long enough for the DPF system to reach optimal temperatures and perform passive regens.

How do You Reset the Fault Code on a Freightliner Cascadia?

Resetting fault codes on a Cascadia requires a compatible diagnostic scan tool. Firstly, plug the tool into the vehicle’s diagnostic port. Ensure the issue triggering the code has been resolved; simply clearing without addressing the problem may cause the code to return. After connecting the tool, run a diagnostic scan to confirm the fault codes. Navigate to the option labeled “Clear Codes” or similar.

Execute the clearing process. It’s crucial to then re-scan, ensuring the codes have been cleared. If they reappear or if the problem persists, professional consultation is advised. Remember, safety and addressing underlying issues are paramount; don’t merely clear codes without ensuring the problem is fixed. Always consult the vehicle’s manual or a technician if uncertain.

How do I Reset EEC 61 Code without a Scanner?

Resetting a Freightliner EEC 61 code without a scanner can be challenging because it is a broad code relating to the vehicle’s emission control system, and it’s crucial to identify and fix the specific issue triggering this code. However, there are basic steps to potentially clear the fault temporarily.

First, ensure the Diesel Exhaust Fluid (DEF) level is adequate. Next, inspect the DEF quality and other related components for visible issues. Perform a manual DPF regeneration by following the vehicle’s manual instructions, which often involves a series of actions using the vehicle’s controls. This process burns off accumulated soot in the DPF, which may clear the EEC 61 code.

For resetting, disconnect the vehicle’s battery cables for several minutes and then reconnect them. This may clear the code temporarily, but it’s crucial to address the underlying issue to prevent the code from reappearing. It’s always recommended to use a diagnostic tool for an accurate assessment and resolution and consult a professional for thorough inspection and repair.


Clearing the EEC 61 code on a Freightliner is more than just erasing an error message—it’s about ensuring the truck’s emission system operates efficiently. Address the issue at its roots for the health of the vehicle and the environment. Always prioritize safety and, when in doubt, seek professional guidance.

How to Clear EEC 61 Code on Freightliner Trucks? Expert Tips | Vehicle Fixing (2024)


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